So that we don't get surprise usages. Bug: 348717861 Test: m nothing Change-Id: I47319a727092c1bd936cca88f5713ee977a48b48
Adds a filegroup "metalava-config-files" whose contents are passed to Metalava using the `--config-file` option. Bug: 354699349 Test: m checkapi Change-Id: I1e246517c2ef678e41214c975aecee97f9faca67